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Effect of polypropylene fiber content and fiber length on the saturated hydraulic conductivity of hydrating cemented paste backfill
Highlights Effect of fibre length and fibre content on hydraulic conductivity is identified. Fibre inclusion mainly affects the initial value of hydraulic conductivity. A predictive model for hydraulic conductivity is proposed.
Abstract Polypropylene fiber reinforcement is considered a promising technique in the mine backfilling operation. However, after placement into underground mined-out space, the hydraulic process affects the mechanical stability of polypropylene fiber-reinforced cemented paste backfill (FR-CPB, an engineered mixture of tailings, binder, water and fibers). Therefore, as a key hydraulic property, the saturated hydraulic conductivity must be quantitatively evaluated for the design of FR-CPB. Correspondingly, a laboratory study was performed in this study to investigate the effect of fiber length (6 mm, 9 mm, and 13 mm), fiber content (0.25%, 0.50%, and 0.75%), and curing time (3, 7, 28, and 90 days) on the saturated hydraulic conductivity of FR-CPB. It has been found that the random distributed discrete fiber mainly affects the initial value of hydraulic conductivity, while the cement hydration governs the time-dependent and nonlinear evolution of hydraulic conductivity, especially during the early ages. Moreover, a higher fiber content causes a larger hydraulic conductivity, while hydraulic conductivity shows a decreasing trend as fiber length increases. Furthermore, a predictive model was developed to estimate the hydraulic conductivity. The good agreement between predicted results and measured data indicates the proposed model can be used as a useful tool to evaluate the combined effect of fiber inclusion and cement hydration on the evolution of hydraulic conductivity of FR-CPB.
Effect of polypropylene fiber content and fiber length on the saturated hydraulic conductivity of hydrating cemented paste backfill
Highlights Effect of fibre length and fibre content on hydraulic conductivity is identified. Fibre inclusion mainly affects the initial value of hydraulic conductivity. A predictive model for hydraulic conductivity is proposed.
Abstract Polypropylene fiber reinforcement is considered a promising technique in the mine backfilling operation. However, after placement into underground mined-out space, the hydraulic process affects the mechanical stability of polypropylene fiber-reinforced cemented paste backfill (FR-CPB, an engineered mixture of tailings, binder, water and fibers). Therefore, as a key hydraulic property, the saturated hydraulic conductivity must be quantitatively evaluated for the design of FR-CPB. Correspondingly, a laboratory study was performed in this study to investigate the effect of fiber length (6 mm, 9 mm, and 13 mm), fiber content (0.25%, 0.50%, and 0.75%), and curing time (3, 7, 28, and 90 days) on the saturated hydraulic conductivity of FR-CPB. It has been found that the random distributed discrete fiber mainly affects the initial value of hydraulic conductivity, while the cement hydration governs the time-dependent and nonlinear evolution of hydraulic conductivity, especially during the early ages. Moreover, a higher fiber content causes a larger hydraulic conductivity, while hydraulic conductivity shows a decreasing trend as fiber length increases. Furthermore, a predictive model was developed to estimate the hydraulic conductivity. The good agreement between predicted results and measured data indicates the proposed model can be used as a useful tool to evaluate the combined effect of fiber inclusion and cement hydration on the evolution of hydraulic conductivity of FR-CPB.
Effect of polypropylene fiber content and fiber length on the saturated hydraulic conductivity of hydrating cemented paste backfill
Chakilam, Sirisha (author) / Cui, Liang (author)
2020-09-06
Article (Journal)
Electronic Resource
English
Saturated hydraulic conductivity of cemented paste backfill
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